I am not sporty. I put in my required hours of standing in the outfield on a softball team and half-heartedly dribbling a soccer ball down a field in my childhood, but sports are generally not my thing. A post-college move to San Francisco thrust me into a world where people were earnestly active—there were touch football games, rock climbing, disc golf. A holiday weekend meant that everyone cleared out of town by Friday at 3 p.m., driving towards the mountains in Subarus, ready to hit the slopes.